Can you find out the missing number in the grid?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

If I put in one canary per cage, I have one bird too many. If I put in two canaries per cage, I have one cage too many. How many cages and canaries do I have?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Three playing cards in a row. Can you name them with these clues? There is a two to the right of a king. A diamond will be found to the left of a spade. An ace is to the left of a heart. A heart is to the left of a spade. Now, identify all three cards.

Find out the number of circles in the given picture having Illusion

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

What four weights can be used to balance from 1 to 30 pounds?

Identify the 10 differences between the two given pictures.

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?